They are not designed to flow high numbers. They are designed for midrange power which is why they have those long runners. Think of this without the fuel puddling issues.
Edelbrock makes a short runner Victor intake but it is designed for 4000-8000 rpms. Where the RPM II is designed for 1500-6500 rpms.
They also make upper box style intakes that are also designed for 4000-8000 rpms.
